In SERVER-24529, the current time was added as a field to the currentOp output. Unfortunately, it was added to every op that is output (including inactive ones). We should move this field to the top level of the output, at the same level as "inprog" and "ok", since we only need to see the time once for a given run of currentOp. We should also change the name of this field to "currentTime" or simply "time", to reduce confusion.